Hickory
The word hickory enters English from a Native American language, likely Powhatan. It shortens terms like pockerchicory or pocohicora. These older words might name the tree's nut itself. Or they could describe a milky drink made from those nuts. The scientific genus name Carya comes from Greek. That ancient word means nut. This linguistic bridge connects modern forestry to indigenous knowledge of the Eastern Woodlands.
Cretaceous pollen grains found in Mexico and New Mexico represent the oldest evidence for this genus. Modern trees first appear in Oligocene strata 34 million years ago. Fossil data suggests diversification occurred during the Miocene epoch. During the Pleistocene Ice Age beginning 2 million years ago, the range collapsed across Europe. The genus disappeared from Anatolia only in the early Holocene. Human disturbance likely contributed to that disappearance there. North American populations also shrank westward past the Rocky Mountains. Early fossil shells were simpler and thinner than today's species. This change suggests gradual development of defenses against rodent seed predation.
Plants of the World Online accepts nineteen accepted species within the genus. Seven species grow native to southeast Asia including China and Indochina. Twelve species remain native to North America. Eleven occur in the United States alone. Four exist in Mexico with one endemic species called C. palmeri. Five extend into southern Canada. Some Asian species like C. sinensis split out as Annamocarya sinensis but genetic data keeps them inside Carya. Hybridization occurs among several species creating around nine named hybrids. The walnut family Juglandaceae places these trees in order Fagales.
Lepidoptera larvae use hickory leaves as a food source for their survival. Luna moths and brown-tail moths feed on the foliage. Regal moth caterpillars known as hickory horn-devils consume the leaves. Hickory leaf stem gall phylloxera forms galls around developing insects in early spring. Deformed leaves rain down when squirrels break off infected tissue. Squirrels eat the galls possibly for protein content or because they are fleshy. The pecan gall curculio feeds on galls of the phylloxera. Banded hickory borer also infests these trees. Phylloxeridae relate closely to aphids yet maintain complex life cycles.
Dried hickory nuts contain 64% fats and 13% protein. They supply significant food energy with 20% or more daily value of manganese. Indigenous peoples of the Eastern Woodlands relied on them since the middle Archaic period. Cherokee people made Kanuchi soup from the nuts. They extracted edible oil by crushing and boiling the remains. Shagbark bark produces green dye used for cloth. Mixing it with maple bark creates yellow pigment. Ashes from burnt wood produce strong lye for soapmaking. Pecans remain the most important nut tree native to North America.
Hickory wood combines strength, toughness, hardness, and stiffness uniquely among commercial woods. Tool handles and wheel spokes require this specific combination of properties. Baseball bats were once made from hickory before ash took over. Scottish shinty sticks now favor hickory as a replacement for ash. Traditional lacrosse sticks utilized hickory until plastic heads appeared in the 1970s. Early aircraft construction extensively used this timber type. Its density makes it efficient fuel for wood-burning stoves. Hickory smoke adds flavor to barbecue meats in the Southern United States. Moisture absorption causes shrinkage and warping changes with humidity shifts.
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Common questions
What is the origin of the word hickory?
The word hickory enters English from a Native American language, likely Powhatan. It shortens terms like pockerchicory or pocohicora which might name the tree's nut itself.
When did the genus hickory first appear in fossil records?
Modern trees first appear in Oligocene strata 34 million years ago. Cretaceous pollen grains found in Mexico and New Mexico represent the oldest evidence for this genus.
How many species are currently accepted within the genus hickory?
Plants of the World Online accepts nineteen accepted species within the genus. Seven species grow native to southeast Asia including China and Indochina while twelve remain native to North America.
Which insects feed on hickory leaves as a food source?
Lepidoptera larvae use hickory leaves as a food source for their survival. Luna moths and brown-tail moths feed on the foliage while regal moth caterpillars known as hickory horn-devils consume the leaves.
What nutritional value do dried hickory nuts provide?
Dried hickory nuts contain 64% fats and 13% protein. They supply significant food energy with 20% or more daily value of manganese.
Why is hickory wood preferred for tool handles and baseball bats?
Hickory wood combines strength, toughness, hardness, and stiffness uniquely among commercial woods. Tool handles and wheel spokes require this specific combination of properties before ash took over for baseball bats.